10,000 m² (100m × 100m) = 2.471 acres. Standard metric unit for land area, used in agriculture and forestry worldwide.

43,560 ft² = 4,047 m² ≈ 0.405 hectares. Originally the area one ox could plow in a day. Used in US/UK for land.

How big is a football field?

American: 57,600 ft² (120 × 53.3 yd) = 1.32 acres. Soccer (FIFA): 7,140-8,250 m² depending on configuration.

What's a square mile?

640 acres = 2.59 km². Used in US for large land areas (ranch sizes, county areas). Section in the Public Land Survey System = 1 square mile.

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